#include"Date.h"

Date::Date(int year, int month, int day)
{
	_year = year;
	_month = month;
	_day = day;
}

bool Date::operator<(const Date& d) const
{
	if (_year < d._year)
	{
		return true;
	}
	else if (_year == d._year)
	{
		if (_month < d._month)
		{
			return true;
		}
		else if (_month == d._month)
		{
			if (_day < d._day)
			{
				return true;
			}
		}
	}
	return false;
}

// d1 <= d2
bool Date::operator<=(const Date& d) const
{
	return *this < d || *this == d;
}

// d1 > d2
bool Date::operator>(const Date& d) const
{
	return !(*this <= d);
}

// d1 >= d2
bool Date::operator>=(const Date& d) const
{
	return !(*this < d);
}

// d1 == d2
bool Date::operator==(const Date& d) const
{
	return _year == d._year && _month == d._month && _day == d._day;
}

// d1 != d2
bool Date::operator!=(const Date& d) const
{
	return !(*this == d);
}

// d1 += 100
// 需要改变 所以加&引用
Date& Date::operator+=(int day)
{
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		++_month;
		if (_month == 13)
		{
			++_year;
			_month = 1;
		}
	}
	return *this;
}
// d1 + 100
Date Date::operator+(int day) const
{
	Date tmp = *this;//拷贝构造
	tmp += day;
	return tmp;	
}

//Date Date::operator+(int day)
//{
//	//Date tmp(*this);
//	Date tmp = *this;//拷贝构造
//	tmp._day += day;
//	while (tmp._day > GetMonthDay(tmp._year, tmp._month))
//	{
//		tmp._day -= GetMonthDay(tmp._year, tmp._month);
//		++tmp._month;
//		if (tmp._month == 13)
//		{
//			++tmp._year;
//			tmp._month = 1;
//		}
//	}
//	return tmp;
//}
//Date& Date::operator+=(int day)
//{
//	*this = *this + day;
//	return *this;
//}

// d1 - 100
Date Date::operator-(int day) const
{
	Date tmp = *this;
	tmp -= day;
	return tmp;
}
// d1 -= 100
Date& Date::operator-=(int day)
{
	_day -= day;
	while (_day <= 0)
	{
		--_month;
		if (_month == 0)
		{
			--_year;
			_month = 12;
		}
		_day += GetMonthDay(_year, _month);
	}
	return *this;
}

// ++d -> d.operator++()
Date& Date::operator++()
{
	*this += 1;
	return *this;
}
// d++ -> d.operator++(0)
Date Date::operator++(int)
{
	Date tmp = *this;
	*this += 1;
	return tmp;
}

// --d -> d.operator()
Date& Date::operator--()
{
	*this -= 1;
	return *this;
}
// d-- -> d.operator(0)
Date Date::operator--(int)
{
	Date tmp = *this;
	*this -= 1;
	return tmp;
}

// d1 - d2 日期-日期
int Date::operator-(const Date& d) const
{
	int falg = 1;
	Date max = d;
	Date min = *this;
	if (*this > d)
	{
		int falg = -1;
		max = *this;
		min = d;
	}
	int n = 0;
	while (min != max)
	{
		++min;
		++n;
	}
	return n * falg;
}

bool Date::CheckInvalid() const
{
	if (_year <= 0 || _month < 1 || _month>12 || _day<1 || _day>GetMonthDay(_year, _month))
	{
		return false;
	}
	else
	{
		return true;
	}
}

ostream& operator<<(ostream& out, const Date & d)
{
	out << d._year << "年" << d._month << "月" << d._day << "日" << endl;
	return out;
}
istream& operator>>(istream& in, Date& d)
{
	while (1)
	{
		cout << "请依次输入年月日:>";
		in >> d._year >> d._month >> d._day;
		
		if (!d.CheckInvalid())
		{
			cout << "亲，输入了无效日期，请重新输入" << endl;
		}
		else
		{
			break;
		}
	}
	return in;
}

